1986 18' open bow f&s; 2nd owner last 12+ yrs; floor has a soft spot in middle of floor just behind the front seats. Hasn't taken the boat out of service yet... Can't tell how extensive rot is without ripping it all up. I'm handy and up for the challenge. Would like to get an expert to quote it before I take it on. any recommendations for expert repair is appreciated. Might be worth having boat back on the water before I can. I've been researching replacement but am open to tips, suggestions, comments, etc.. I'll check stringers and use marine plywood,stainless screws & fiberglass/resin. Questions: How thick plywood & who carries it? Would CDX work? Any comments on floatation foam? Any good options besides carpeting? I Plan on keeping boat for awhile. Thanks in advance.